IRS class

IRS class of tugboats are a series of Bollard pull tugboats built by Hindustan Shipyard Limited, Visakhapatnam, for the Indian Navy.

Class overview
Builders: Hindustan Shipyard Limited
Operators:  Indian Navy
Built: 3
Planned: 3
Completed: 3
Active: 3
General characteristics
Type: 50T Bollard Pull Tugboat
Displacement: 472 tons
Length: 34.54 m (113.3 ft)
Beam: 11.26 m (36.9 ft)
Draught: 4.49 m (14.7 ft)
Propulsion: 2 x Wartsila Italia Spa Type W8L26 engines generating 2.4 MW power to drive Voith Schneider propulsion unit
Speed: 13.5 knots (25.0 km/h; 15.5 mph)
Complement: 13

INS Sahas and INS Dhiraj tugs were flagged off by Commander (retd) K.S. Subramanian, the Director (shipbuilding) and INS Himmat was flagged off by Rear Admiral (Retd) N K Mishra, NM Chairman & Managing Director of HSL. The vessels were built under special survey of IRS Steel ship rules and as such were assigned with IRS class notation.[1][2]

Specifications

Each of these tugboats can achieve 13.5 knots against a design speed of 12 knots at 85% maximum continuous rating. Bollard pull of all the vessels is in excess of 54 tonnes almost 10% in excess of specifications.[3][4]

Service history

INS Himmat, INS Sahas and INS Dhiraj serve with the Western Naval Command at Karwar. These vessels are primarily meant to handle Aircraft carrier INS Vikramaditya which is based in Karwar since early 2014.[5]

Boats in the class
NamePennant No.Date of LaunchDate of CommissionHomeportStatus
INS Himmat1116203-08-201331-03-2014KarwarActive [6]
INS Dhiraj1116303-08-201324-12-2013KarwarActive
INS Sahas1116403-08-201324-12-2013KarwarActive

See also

References
  1. "HSL delivers 2 tugs to Navy".
  2. "HSL delivers 50T BP Tug to Indian Navy".
  3. "HSL delivers 50T BP Tug to Indian Navy".
  4. "HSL delivers 2 tugs to Navy".
  5. "Hind Shipyard delivers 2 tugs to Navy - classed with IRS".
  6. "64_AR_2015-16.pdf" (PDF).
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